hiya
didn't know if you knew but there are 2 fans on this model, i have got the same problem, we changed the back fan only to find that we still had the same noise, on investigating we found the 2nd fan (longer and skinnier) which is a little bit more difficult to get at. (you need to take the right side of the machine off move the wiring out the way and then prise open the plastic casing and voila the offending object is in front of you.) If you have replaced this one then the other short slim wide one is behind the back casing and is easy to get to
mumma1
March 2010